Nanoose First Nation WWTP, Nanoose Bay, BC

Case Study

Initial phase of this advanced wastewater treatment plant serves Snaw-naw-as First Nation village at Nanoose Bay. The plant has been designed to be expanded in the future to serve neighbouring commercial and residential developments. Since the treated effluent is discharged into the very sensitive environment of Nanoose Bay, high quality effluent was stipulated: BOD, TSS and Total Nitrogen of less than respectively 10, 10 and 20 mg/l, ammonia nitrogen of less than 1 mg/l and fecal coliform of less than 14/100 ml. The system consists of fine mechanical drum screen, USBF sludge filters, sand filters and UV disinfection. It includes two bioreactor modules and a provision has been made for future modular expansion. Phase 1 of the plant was built in 2005 and started up on October 20, 2005. The plant is operated by ECOfluid under contract with the Snaw-naw-as First Nation

OPERATING RESULTS Date BOD5 [mg/l] TSS [mg/l] Turbidity [NTU] Nitrite Nitrate [mg/l] Ammonia Nitrogen [mg/l] TKN [mg/l] Total Nitrogen [mg/l] Fecal Coliform [CFU/100 ml] November 1, 2005 < 5 < 5   18.0   0.7 18.7 < 1 November 8, 2005 < 5 < 2   1.6   2.2 3.81 < 1 November 17, 2005 < 5 3     0.04   15.3 < 1 December 13, 2005 < 10 < 2   16.8   2.4 19.2 < 10 January 9, 2006 < 10 3   10.3   1.2 11.5 < 1 February 8, 2006 < 10 7   15.6   2.3 17.9 < 1 April 11, 2006 < 10 < 1   15.2   2.0 17.2 < 1 May 10, 2006 < 10 < 1   14.0 0.08 1.0 15.0 < 1 June 6, 2006 < 10 < 1   6.6 0.03 1.1 10.7 < 1 July 5, 2006 < 10 < 1   10.9 0.04 0.8 11.7 < 1 August 9, 2006 < 10 < 1 0.75 6.4   1.4 7.8 < 1 September 13, 2006 < 10 < 1 0.77 14.5   0.9 15.4 < 1 October 9, 2006 < 10 < 1 0.65 17.8   0.2 18.0 < 1 November 15, 2006 < 10 1 0.98 10.1 0.08 1.2 11.3 < 1 December 13, 2006 < 10 < 1 0.34 10.7   0.6 11.3 < 1 Design Parameters 10 10     1   20 14 (1) Less than (<) signifies detectable limit (different labs, different limits)